Information Schema INNODB_SYS_TABLES Table
The Information Schema INNODB_SYS_TABLES table contains information about InnoDB tables.
The PROCESS privilege is required to view the table.
It has the following columns:
| Field | Type | Null | Key | Default | Description |
|---|---|---|---|---|---|
| TABLE_ID | bigint(21) unsigned | NO | 0 | Unique InnoDB table identifier. | |
| NAME | varchar(655) | NO | Database and table name, or the uppercase InnoDB system table name. | ||
| FLAG | int(11) | NO | 0 | See Flag below | |
| N_COLS | int(11) unsigned (>= MariaDB 10.5) int(11) (<= MariaDB 10.4) | NO | 0 | Number of columns in the table. The count includes two or three hidden InnoDB system columns, appended to the end of the column list: DB_ROW_ID (if there is no primary key or unique index on NOT NULL columns), DB_TRX_ID, DB_ROLL_PTR. | |
| SPACE | int(11) unsigned (>= MariaDB 10.5) int(11) (<= MariaDB 10.4) | NO | 0 | Tablespace identifier where the index resides. 0 represents the InnoDB system tablespace, while any other value represents a table created in file-per-table mode (see the innodb_file_per_table system variable). Remains unchanged after a TRUNCATE TABLE statement. | |
| FILE_FORMAT | varchar(10) | YES | NULL | InnoDB file format (Antelope or Barracuda). Removed in MariaDB 10.3. | |
| ROW_FORMAT | enum('Redundant', 'Compact', 'Compressed', 'Dynamic') (>= MariaDB 10.5) varchar(12) (<= MariaDB 10.4) | YES | NULL | InnoDB storage format (Compact, Redundant, Dynamic, or Compressed). | |
| ZIP_PAGE_SIZE | int(11) unsigned | NO | 0 | For Compressed tables, the zipped page size. | |
| SPACE_TYPE | enum('Single','System') (>= MariaDB 10.5) varchar(10) (<= MariaDB 10.4) | YES | NULL |
Flag
The flag field returns the dict_table_t::flags that correspond to the data dictionary record.
| Bit | Description |
|---|---|
0 | Set if ROW_FORMAT is not REDUNDANT. |
1 to 4 | 0, except for ROW_FORMAT=COMPRESSED, where they will determine the KEY_BLOCK_SIZE (the compressed page size). |
5 | Set for ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED. |
6 | Set if the DATA DIRECTORY attribute was present when the table was originally created. |
7 | Set if the page_compressed attribute is present. |
8 to 11 | Determine the page_compression_level. |
12 13 | Normally 00, but 11 for "no-rollback tables" (MariaDB 10.3 CREATE SEQUENCE). In MariaDB 10.1, these bits could be 01 or 10 for ATOMIC_WRITES=ON or ATOMIC_WRITES=OFF. |
Note that the table flags returned here are not the same as tablespace flags (FSP_SPACE_FLAGS).
Example
SELECT * FROM information_schema.INNODB_SYS_TABLES LIMIT 2\G
*************************** 1. row ***************************
TABLE_ID: 14
NAME: SYS_DATAFILES
FLAG: 0
N_COLS: 5
SPACE: 0
ROW_FORMAT: Redundant
ZIP_PAGE_SIZE: 0
SPACE_TYPE: System
*************************** 2. row ***************************
TABLE_ID: 11
NAME: SYS_FOREIGN
FLAG: 0
N_COLS: 7
SPACE: 0
ROW_FORMAT: Redundant
ZIP_PAGE_SIZE: 0
SPACE_TYPE: System
2 rows in set (0.00 sec)
See Also
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